I’m sympathetic to the idea that philosophy as its own focus/major should be shuttered. If you’re doing “philosophy” and you’re being careful and intellectually honest, then you can probably do it in the math department.
In philosophy, Tarski (a logician) feels adjacent to Montague (a logician who studied semantics), and Montague feels adjacent to Austin (a philosopher who studied semantics). If we were to shutter philosophy, the math department would lay claim to Tarski, the linguistics department to Montague and Austin. I think its useful to have them in conversation with each other.
But ultimately I think its very hard to argue that philosophy has got enough new work being done; my metric is whether or not a discipline's "2017 in <discipline>" page on Wikipedia has a greater number of accomplishments than deaths, and philosophy's is not looking so good in that regard: https://en.wikipedia.org/wiki/2017_in_philosophy